AWWA IMTECH57850

This paper discusses how, through the integration of the data available in multiple information systems and technologies, EPCOR Water Services, Incorporated (EWSI) optimized the flushing frequency of their Unidirectional Flushing (UDF) Maintenance Program and effectively reduced their annual UDF costs by 25%. Five systems are integrated to develop an optimal unidirectional flushing program: unidirectional flushing (UDF) application; water maintenance management (WaMM) system; hydraulic model; Laboratory Information Management System (LIMS); and, Geographical Information System (GIS). The UDF Application and GIS are evident systems involved in the UDF Maintenance Program. Together they generate the bridge between the field and the office through data forms and maps. Each year the run designs are illustrated and the flushing results are recorded through these documents. The UDF Application and GIS are also essential for the design of the UDF runs. As well, the hydraulic model of the distribution system can be applied to confirm water flows and velocities to ensure an overall effective and efficient design. WaMM contains information significant for the actual practice of flushing. It supports the UDF Maintenance Program through ensuring the operability of the valves and hydrants or at least identifying any out-of-service assets that may require runs to be redesigned. LIMS is a valuable tool to monitor the effectiveness of UDF. The water quality records for both sampling specific to the flushing and sampling based on customer complaints provide direction to problematic areas of the distribution system. Each system has an independent part to play in the design of unidirectional flushing runs; together the systems can be used to optimize the UDF Program. In 2002, EPCOR Water Services Incorporated took a step back and questioned their existing Unidirectional Flushing Maintenance Program. Through efficient flushing, large cost savings can be realized through reduced manpower, energy consumption, and water consumption. A four-month UDF Frequency Optimization Study was conducted that compiled seven years of UDF data and combined the applicable information technology. The optimization study was a success because the information organization enabled an informed and confident decision. The decision to extend flushing frequencies up to four years resulted from an invested $8,000 study; study recommendations resulted in savings of approximately $150,000 Canadian dollars for the 2002 flushing season. Includes tables, figures.